Fix Vaadin displaying styles

Author: AB-xdev

demo/webapp-vaadin/src/main/java/software/xdev/sse/demo/Application.java

@@ -10,17 +10,14 @@
 import org.springframework.scheduling.annotation.EnableAsync;
 import org.springframework.scheduling.annotation.EnableScheduling;
 
-import com.vaadin.flow.component.dependency.StyleSheet;
 import com.vaadin.flow.spring.annotation.EnableVaadin;
-import com.vaadin.flow.theme.lumo.Lumo;
 
 
 @SuppressWarnings({"checkstyle:HideUtilityClassConstructor", "PMD.UseUtilityClass"})
 @SpringBootApplication(exclude = {ErrorMvcAutoConfiguration.class})
 @EnableScheduling
 @EnableAsync
 @EnableVaadin("software.xdev.sse.demo.ui")
-@StyleSheet(Lumo.STYLESHEET)
 public class Application
 {
 	@SuppressWarnings("PMD.AvoidSystemSetterCall")

demo/webapp-vaadin/src/main/java/software/xdev/sse/demo/ui/AppShell.java

@@ -2,19 +2,22 @@
 
 import java.util.Map;
 
+import com.vaadin.flow.component.dependency.StyleSheet;
 import com.vaadin.flow.component.page.AppShellConfigurator;
 import com.vaadin.flow.component.page.Push;
 import com.vaadin.flow.server.AppShellSettings;
+import com.vaadin.flow.theme.lumo.Lumo;
 
 
+@StyleSheet("context://" + Lumo.STYLESHEET)
 @Push
 public class AppShell implements AppShellConfigurator
 {
 	@Override
 	public void configurePage(final AppShellSettings settings)
 	{
 		// Don't use Vaadin's PWA implementation because it can only handle PNGs
-		// Also it renders them for each IPhone resolution in existence, which bloats up the delivered content
+		// Also it renders them for each iPhone resolution in existence, which bloats up the delivered content
 		settings.addLink(
 			"manifest.webmanifest",
 			Map.of(